In all honesty how far can you take microblogging? Twitter's core business is something any half decent developer can build over a weekend and polish over a few months.
There is so much you can do to attract and keep your users engaged with Twitter's core business.
For the growth Twitter investors are looking, twitter needs to expand beyond its 140 character tweets and look for possible innovative ideas that can cultivate with its current infrastructure, data and talent.
It looks like a weekend project but isn't. Scaling it up took Twitter a long time. Showing your feed is a very expensive operation (there are users with a large number of followers and users who follow many others) and syndication and clients amplify the number of operations.
Source: I was one of the developers of Jaiku, which had a very similar model.
There is so much you can do to attract and keep your users engaged with Twitter's core business.
For the growth Twitter investors are looking, twitter needs to expand beyond its 140 character tweets and look for possible innovative ideas that can cultivate with its current infrastructure, data and talent.